Dear customers , when you get cargo , if you are satisfied with our product, we appreciate you to give us 5 start feedback. Please do not open dispute or leave bad feedback without any communication with us , respect is mutual. This product has temperature sensor optional needs extra value , and if need camera function needs order quantity 200sets. Attention :bluetooth works iphone above 6s, version above IOS9.0, android version above 5 , some android mobiles may not work bluetooth. 1 pc alarm led, 1pc reset button.